diff --git a/wifi/1.0/IWifiRttControllerEventCallback.hal b/wifi/1.0/IWifiRttControllerEventCallback.hal
new file mode 100644
index 0000000..e23e395
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+++ b/wifi/1.0/IWifiRttControllerEventCallback.hal
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.wifi@1.0;
+
+/**
+ * RTT Response and Event Callbacks.
+ */
+interface IWifiRttControllerEventCallback {
+  /**
+   * Invoked when an RTT result is available.
+   *
+   * @param cmdId command Id corresponding to the original request.
+   * @param results Vector of |RttResult| instances.
+   */
+  oneway onResults(CommandId cmdId, vec<RttResult> results);
+};